Battery pack and vehicle

Abstract

The utility model belongs to the technical field of automobiles, and discloses a battery pack and a vehicle, the battery pack comprises a battery module, a liquid cooling plate and a heating film, the two end faces of the heating film are connected to the battery module and the liquid cooling plate respectively, and the heating film comprises a first heating film and a second heating film which are arranged at an interval; the second heating film is located on the inner side of the first heating film, and the heating area of the first heating film is larger than the heating area of the second heating film, so that the connection stability of the liquid cooling plate and the battery module is guaranteed, the cooling effect on the battery module is guaranteed, and in addition, when the battery module is cooled or heated, the battery module is cooled or heated. And the heat distribution of the battery module is more uniform, so that the performance of the battery pack is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of automobiles, specifically relating to a battery pack and a vehicle. Background Technology

[0002] As a core component of new energy vehicles, the operating temperature of the battery pack directly affects its performance and lifespan. Therefore, battery packs are generally equipped with liquid cooling plates and heating films. When the temperature of the battery module is higher than the set temperature, the medium flowing through the inside of the liquid cooling plate absorbs the heat from the battery module, thereby lowering the temperature of the battery module and achieving cooling. When the temperature of the battery module is lower than the set temperature, the heating film generates heat and transfers it to the battery module, thereby raising the temperature of the battery module and achieving heating. This allows the battery module to operate within an optimal temperature range, ensuring the performance of the battery pack and extending its lifespan.

[0003] Currently, heating films are typically attached to the sides of battery modules. However, they are prone to detachment when the vehicle vibrates on bumpy roads. Because the detached heating film cannot directly transfer heat to the cooler battery module, it is susceptible to dry burning, thus affecting the safety of the battery pack. To improve the connection stability between the heating film and the battery module, thereby enhancing battery pack safety, a battery pack has emerged that places the entire heating film between the liquid cooling plate and the battery module. While this improves the connection stability, since the battery module is connected to the liquid cooling plate via thermally conductive adhesive, placing the entire heating film between them reduces the connection area and direct heat transfer area between the liquid cooling plate and the battery module. This results in a decrease in the structural strength and cooling effect of the battery pack. Therefore, ensuring the structural strength and cooling effect of the battery pack has become a pressing technical problem to be solved. In addition, since the sides of the battery module are closer to the outside of the vehicle than the center, there is a temperature difference between the sides and the center. Therefore, improving the uniformity of heat distribution in the battery module when cooling or heating it has become an urgent technical problem to be solved. Utility Model Content

[0004] This application provides a battery pack to improve battery pack safety, ensure battery pack structural strength and cooling effect, and improve the uniformity of heat distribution of battery module when cooling or heating battery module.

[0005] The technical solution adopted in this application is as follows:

[0006] A battery pack includes a battery module, a liquid cooling plate, and a heating film disposed between the battery module and the liquid cooling plate. One end face of the heating film is connected to the battery module, and the other end face of the heating film is connected to the liquid cooling plate. The heating film includes a first heating film and a second heating film spaced apart from each other. The second heating film is located inside the first heating film, and the heating area of ​​the second heating film is smaller than the heating area of ​​the first heating film.

[0007] By adopting the above technical solution, since the heating film is located between the battery module and the liquid cooling plate, the connection stability between the heating film and the battery module is increased, so as to avoid the situation of dry burning caused by the heating film easily separating from the battery module, thereby improving the safety of the battery pack.

[0008] Furthermore, since the heating film includes a first heating film and a second heating film, which are spaced apart, compared to the existing technology that places the entire heating film between the liquid cooling plate and the battery module, this design allows for two advantages. First, the gap between the first and second heating films can be used to fix the liquid cooling plate and the battery module together with thermally conductive adhesive, thereby increasing the connection area between the liquid cooling plate and the battery module through the thermally conductive adhesive. This improves the structural strength of the battery pack and the heat transfer area between the liquid cooling plate and the battery module through the thermally conductive adhesive, thus enhancing the cooling effect on the battery module. Second, the area of ​​the first and second heating films can be reduced to decrease the amount of heating film used, thereby reducing the production cost and weight of the battery pack.

[0009] Furthermore, since the second heating film is located inside the first heating film, the first heating film is located on the side of the battery module, while the second heating film is located at the center of the battery module. The heating area of ​​the second heating film is smaller than that of the first heating film, so that when the heating film heats the battery module, the heating intensity at the center of the battery module is less than that at the side of the battery module. This reduces the temperature difference between the side and the center of the battery module, making the heat distribution of the battery module more uniform when it is heated, thereby ensuring the performance of the battery pack.

[0010] Furthermore, since the heating film is placed between the liquid cooling plate and the battery module, when the battery module is cooled using the medium flowing through the liquid cooling plate, the heating film affects the direct heat transfer area between the liquid cooling plate and the battery module. Moreover, the cooling requirement at the center of the battery module is greater than that at the sides. In this application, by setting the heating area of ​​the second heating film to be smaller than that of the first heating film, the influence of the second heating film on the direct heat transfer area between the center of the battery module and the liquid cooling plate can be reduced, thereby increasing the direct heat transfer area between the liquid cooling plate and the center of the battery module. This improves the cooling effect of the liquid cooling plate on the center of the battery pack, reduces the temperature difference between the sides and the center of the battery module, and makes the heat distribution of the battery module more uniform when cooling the battery module, thus ensuring the performance of the battery pack.

[0011] Optionally, the width of the first heating film is greater than the width of the second heating film, so that the heating area of ​​the first heating film is greater than the heating area of ​​the second heating film.

[0012] By adopting the above technical solution, since the width of the first heating film is greater than the width of the second heating film, on the one hand, the heating area of ​​the first heating film is greater than that of the second heating film, and on the other hand, the influence of the second heating film on the direct heat transfer area between the center position of the battery module and the liquid cooling plate can be reduced, so as to further ensure the cooling effect on the center position of the battery module.

[0013] Optionally, the first heating film is provided with a first adhesive-receiving hole, which penetrates the first heating film in the thickness direction.

[0014] And / or, the second heating film is provided with a second adhesive-receiving hole, which penetrates the second heating film in the thickness direction.

[0015] By adopting the above technical solution, since the first heating film is provided with a first adhesive cavity, thermally conductive structural adhesive can be injected into the first adhesive cavity to fix the liquid cooling plate and the battery module together using the thermally conductive structural adhesive injected into the first adhesive cavity. On the one hand, this increases the connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby increasing the connection stability between the liquid cooling plate and the battery module. On the other hand, it increases the heat transfer area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby ensuring the cooling effect on the battery module. Furthermore, it also increases the connection stability between the first heating film and the liquid cooling plate and the battery module.

[0016] Because the second heating film is provided with a second adhesive cavity, thermally conductive structural adhesive can be injected into the second adhesive cavity to fix the liquid cooling plate and the battery module together. On the one hand, this increases the connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby increasing the connection stability between the liquid cooling plate and the battery module. On the other hand, it increases the heat transfer area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby ensuring the cooling effect on the battery module. Furthermore, it also increases the connection stability between the first heating film, the liquid cooling plate, and the battery module.

[0017] Optionally, a first clearance notch is provided on the side of the first heating film, and the first clearance notch penetrates the first heating film in the thickness direction of the first heating film;

[0018] And / or, a second clearance notch is provided on the side of the second heating film, the second clearance notch penetrating the second heating film in the thickness direction of the second heating film.

[0019] By adopting the above technical solution, since the first heating film has a first clearance notch on its side, the area of ​​the first heating film is reduced, thereby increasing the connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive. This further ensures the connection stability between the liquid cooling plate and the battery module and further ensures the structural strength of the battery pack. At the same time, it further reduces the amount of heating film used, thereby further reducing the production cost and weight of the battery pack.

[0020] Because the second heating film has a second clearance notch on its side, the area of ​​the second heating film is reduced, thereby increasing the connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive. This further ensures the connection stability between the liquid cooling plate and the battery module and further ensures the structural strength of the battery pack. At the same time, it further reduces the amount of heating film used, thereby further reducing the production cost and weight of the battery pack.

[0021] Optionally, the battery module includes a first battery module and a second battery module. At least two first heating films are provided, and the two first heating films are respectively located on the side of the first battery module and the second battery module that are far apart from each other. At least two second heating films are provided, and the two second heating films are respectively located on the side of the first battery module and the second battery module that are close to each other.

[0022] By adopting the above technical solution, since the battery module includes a first battery module and a second battery module, the side of the battery module is the side where the first battery module and the second battery module are far apart from each other, while the center of the battery module is the side where the first battery module and the second battery module are close to each other. By placing the two first heating films on the side where the first battery module and the second battery module are far apart from each other, the heating effect on the side of the battery module can be guaranteed. By placing the two second heating films on the side where the first battery module and the second battery module are close to each other, the heating effect on the center of the battery module can be guaranteed.

[0023] Optionally, a conductive wire bundle is provided between the first heating film and the second heating film. The two ends of the conductive wire bundle are respectively connected to the same end of the first heating film and the second heating film. A conductive terminal is provided at the end of the first heating film and the second heating film away from the conductive wire bundle. The conductive terminals on two adjacent second heating films are plugged into each other.

[0024] By adopting the above technical solution, since the two ends of the conductive wire harness are respectively connected to the same end of the first heating film and the second heating film, and the conductive terminals on the two adjacent second heating films are plugged in, the first heating film and the second heating film are connected end to end, and the two adjacent second heating films are connected end to end, thereby reducing the number of circuit connectors that the vehicle needs to configure for the heating film, and thus reducing the production cost of the vehicle equipped with the battery pack of this application; at the same time, it can also make the weight distribution of the battery pack more uniform, so as to optimize the weight distribution ratio of the vehicle in the later stage.

[0025] Optionally, the ends of the first heating film and the second heating film are both bent toward the side where the battery module is located to form a connecting segment, and the connecting segment is located on the outside of the battery module.

[0026] By adopting the above technical solution, since the ends of both the first heating film and the second heating film are bent towards the side where the battery module is located to form a connecting section, and the connecting section is located on the outside of the battery module, the conductive wire harness and conductive terminals can avoid the battery module from squeezing the conductive wire harness and conductive terminals, thereby ensuring the service life of the conductive wire harness and conductive terminals, thus ensuring the service life of the battery pack and reducing the failure rate of the battery pack. Furthermore, compared with the solution where the conductive wire harness and conductive terminals are located between the liquid cooling plate and the battery module, the distance between the liquid cooling plate and the battery module is reduced, thereby ensuring the cooling efficiency and heating efficiency of the battery module.

[0027] Optionally, a reinforcing layer is provided on the outside of each of the connecting segments, and the conductive wire harness and the conductive terminal wire harness are at least partially located within the corresponding reinforcing layer.

[0028] By adopting the above technical solution, since the reinforcement layer is located outside the connection section and the wire harnesses of the conductive wire harness and the conductive terminal are at least partially located inside the corresponding reinforcement layer, the connection stability between the conductive wire harness and the connection section is increased, thereby ensuring the electrical connection stability between the conductive wire harness and the conductive terminal and the heating film, thus ensuring the heating effect of the heating film on the battery module and reducing the failure rate of the battery pack.

[0029] Optionally, the battery pack further includes a housing, with connecting beams provided on opposite sides of the housing, and the battery module having connecting ears connected to the connecting beams. The conductive wire harness and the conductive terminal wire harness are both connected to the connecting beams via fasteners.

[0030] By adopting the above technical solution, since the housing is equipped with a connecting beam and the battery module is equipped with a connecting lug connected to the connecting beam, the battery module can be fixedly connected to the housing using the connecting lug, thereby increasing the stability of the battery module and preventing the battery module and housing from shaking relative to each other, which would affect the service life of the battery pack, thus ensuring the service life of the battery pack.

[0031] Furthermore, since the conductive wire harness and the conductive terminal harness are both connected to the connecting beam by fasteners, the conductive wire harness and the conductive terminal harness are thus fixed, thereby increasing the stability of the conductive wire harness and the conductive terminal harness and preventing abnormal noise caused by the relative shaking of the conductive wire harness and the conductive terminal harness with the housing. This improves the quality of the battery pack, reduces abnormal noise in vehicles equipped with the battery pack of this application, and thus improves the user experience.

[0032] Furthermore, by installing connecting beams inside the enclosure, the structural strength of the enclosure can be increased, thereby increasing the structural strength of the battery pack and ultimately extending its lifespan.

[0033] Optionally, the connecting beam is provided with a receiving notch, and the connecting segment is located in the receiving notch.

[0034] By adopting the above technical solution, since the connecting section is located in the accommodating notch, it can avoid the connecting beam, thereby reducing the gap between the connecting beam and the battery module. This reduces the size of the connecting ear, thereby lowering the production cost of the connecting ear and improving the connection stability between the battery module and the connecting beam through the connecting ear. It also reduces the volume of the battery pack, facilitating miniaturization design. In addition, the accommodating notch also positions the heating film, making it easier to accurately install the heating film onto the liquid cooling plate. This reduces the installation difficulty of the heating film, improving battery pack production efficiency and ensuring battery pack production quality.

[0035] This application also discloses a vehicle for improving vehicle safety.

[0036] A vehicle comprising the battery pack described above.

[0037] By adopting the above technical solution, since the vehicle in this application uses the aforementioned battery pack, the situation where the heating film easily detaches from the battery module is avoided, thus preventing the heating film from dry burning and eliminating potential safety hazards of the vehicle, thereby improving vehicle safety. In addition, the structural strength and cooling effect of the battery pack are also guaranteed to ensure the performance of the battery pack, thereby ensuring the performance of the vehicle.

[0038] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0039] 1. The battery pack in this application includes a battery module, a liquid cooling plate, and a heating film disposed between the battery module and the liquid cooling plate. The two ends of the heating film are respectively connected to the battery module and the liquid cooling plate, thereby increasing the connection stability between the heating film and the battery module and preventing dry burning due to easy separation of the heating film from the battery module, thus improving the safety of the battery pack. The heating film includes a first heating film and a second heating film spaced apart. Compared to the prior art where a single heating film is disposed between the liquid cooling plate and the battery module, the gap between the first and second heating films allows the liquid cooling plate and the battery module to be fixedly connected together using thermally conductive structural adhesive. The connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive is increased, thereby improving the structural strength of the battery pack and the heat transfer area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thus improving the cooling effect on the battery module. The second heating film is located inside the first heating film, and the heating area of ​​the second heating film is smaller than that of the first heating film. This ensures that when the heating film heats the battery module, the heating intensity at the center of the battery module is less than the heating intensity at the edges of the battery module, thereby reducing the temperature difference between the edges and the center of the battery module. This results in a more uniform heat distribution in the battery module when it is heated, thus ensuring the performance of the battery pack.

[0040] 2. The width of the first heating film in this application is greater than the width of the second heating film. This results in the heating area of ​​the first heating film being greater than that of the second heating film, and also reduces the impact of the second heating film on the direct heat transfer area between the center of the battery module and the liquid cooling plate, thereby further ensuring the cooling effect on the center of the battery module.

[0041] 3. The first heating film in this application is provided with a first adhesive-containing hole, which penetrates the first heating film in the thickness direction, thereby allowing thermally conductive structural adhesive to be injected into the first adhesive-containing hole. This allows the liquid cooling plate and the battery module to be fixedly connected together using the thermally conductive structural adhesive injected into the first adhesive-containing hole. On the one hand, this increases the connection area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby increasing the connection stability between the liquid cooling plate and the battery module. On the other hand, it increases the heat transfer area between the liquid cooling plate and the battery module through the thermally conductive structural adhesive, thereby ensuring the cooling effect on the battery module. Furthermore, it also increases the connection stability between the first heating film and the liquid cooling plate and the battery module. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0043] Figure 1This is a partial structural diagram of the battery pack described in one embodiment of this application;

[0044] Figure 2 This is an exploded view of a portion of the battery pack structure described in one embodiment of this application;

[0045] Figure 3 This is a schematic diagram showing the connection relationship between the heating film and the liquid cooling plate in one embodiment of this application;

[0046] Figure 4 This is a schematic diagram of the connection relationship between the heating film and the liquid cooling plate in one embodiment of this application from another perspective.

[0047] Figure 5 This is a schematic diagram of the structure of the heating film described in one embodiment of this application;

[0048] Figure 6 This is a schematic diagram of the heating film from another perspective in one embodiment of this application;

[0049] Figure 7 This is a schematic diagram showing the connection relationship between the heating film and the battery module in one embodiment of this application;

[0050] Figure 8 This is a schematic diagram from another perspective showing the connection relationship between the heating film and the battery module in one embodiment of this application.

[0051] Figure label:

[0052] 1. Battery module; 11. First battery module; 111. Connecting ear; 12. Second battery module; 2. Liquid cooling plate; 3. Heating film; 31. First heating film; 311. First clearance notch; 312. First adhesive receiving hole; 313. Conductive wire harness; 314. Conductive terminal; 315. Fastener; 32. Second heating film; 321. Second clearance notch; 322. Second adhesive receiving hole; 323. Reinforcing layer; 4. Housing; 41. Connecting beam; 411. Accommodation notch; 42. Separating beam. Detailed Implementation

[0053] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0055] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0058] Reference Figures 1 to 8 A battery pack is disclosed, which includes a battery module 1, a liquid cooling plate 2, and a heating film 3 disposed between the battery module 1 and the liquid cooling plate 2. One end of the heating film 3 is connected to the battery module 1, and the other end of the heating film 3 is connected to the liquid cooling plate 2. The heating film 3 includes a first heating film 31 and a second heating film 32 disposed at intervals. The second heating film 32 is located inside the first heating film 31, and the heating area of ​​the second heating film 32 is smaller than the heating area of ​​the first heating film 31.

[0059] It is understandable that the battery module 1 and the liquid cooling plate 2 are arranged opposite each other, that is, the projection of the battery module 1 toward the plane of the liquid cooling plate 2 is located inside the liquid cooling plate 2; one end face of the heating film 3 in the thickness direction is connected to the battery module 1, and the other end face of the heating film 3 in the thickness direction is connected to the liquid cooling plate 2.

[0060] It should be noted that the first heating film 31 has an outer side facing the outside of the battery module 1 and an inner side opposite to the outer side. The second heating film 32 located inside the first heating film 31 means that the second heating film 32 is located on the side of the first heating film 31 away from the outside of the battery module 1. That is, the first heating film 31 is located on the side of the battery module 1, and the second heating film 32 is located at the center of the battery module 1. The heating area of ​​the first heating film 31 refers to the projected area of ​​the first heating film 31 facing the plane where the liquid cooling plate 2 is located, and the heating area of ​​the second heating film 32 refers to the projected area of ​​the second heating film 32 facing the plane where the liquid cooling plate 2 is located.

[0061] Since the heating film 3 is located between the battery module 1 and the liquid cooling plate 2, the connection stability between the heating film 3 and the battery module 1 is increased, so as to avoid the situation of dry burning caused by the heating film 3 easily separating from the battery module 1, thereby improving the safety of the battery pack.

[0062] Furthermore, since the heating film 3 includes a first heating film 31 and a second heating film 32, which are spaced apart, compared to the prior art where the entire heating film 3 is placed between the liquid cooling plate 2 and the battery module 1, on the one hand, the gap between the first heating film 31 and the second heating film 32 can be used to fix the liquid cooling plate 2 and the battery module 1 together with thermally conductive structural adhesive, thereby ensuring the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive. This improves the structural strength of the battery pack and the heat transfer area of ​​the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thus ensuring the cooling effect on the battery module 1. On the other hand, the area of ​​the first heating film 31 and the second heating film 32 can be reduced to decrease the amount of heating film 3 used, thereby reducing the production cost and weight of the battery pack.

[0063] Furthermore, since the second heating film 32 is located inside the first heating film 31, the first heating film 31 is located on the side of the battery module 1, while the second heating film 32 is located at the center of the battery module 1. The heating area of ​​the second heating film 32 is smaller than that of the first heating film 31, so that when the heating film 3 heats the battery module 1, the heating intensity at the center of the battery module 1 is less than that at the side of the battery module 1, thereby reducing the temperature difference between the side and the center of the battery module 1. This makes the heat distribution of the battery module 1 more uniform when it is heated, thus ensuring the performance of the battery pack.

[0064] Furthermore, since the heating film 3 is placed between the liquid cooling plate 2 and the battery module 1, when the battery module 1 is cooled using the medium flowing through the liquid cooling plate 2, the heating film 3 affects the direct heat transfer area between the liquid cooling plate 2 and the battery module 1. Moreover, the cooling requirement at the center of the battery module 1 is greater than that at the sides. In this application, by setting the heating area of ​​the second heating film 32 to be smaller than that of the first heating film 31, the influence of the second heating film 32 on the direct heat transfer area between the center of the battery module 1 and the liquid cooling plate 2 can be reduced, thereby increasing the direct heat transfer area between the liquid cooling plate 2 and the center of the battery module 1. This improves the cooling effect of the liquid cooling plate 2 on the center of the battery pack, reduces the temperature difference between the sides and the center of the battery module 1, and makes the heat distribution of the battery module 1 more uniform when cooling the battery module 1, thus ensuring the performance of the battery pack.

[0065] The better one is to refer to Figure 3 and Figure 4 The liquid cooling plate 2 has an installation area for mounting the heating film 3 and an adhesive area that avoids the heating film 3. The adhesive area of ​​the liquid cooling plate 2 is fixedly connected to the battery module 1 by thermally conductive structural adhesive to ensure the connection stability between the liquid cooling plate 2 and the battery module 1 and the heat transfer efficiency between the liquid cooling plate 2 and the battery module 1.

[0066] This application does not specify the connection method between the heating film 3 and the battery module 1. Preferably, the heating film 3 is also fixedly connected to the battery module 1 by thermally conductive structural adhesive to improve the connection stability between the heating film 3 and the battery module 1 and to ensure the heat transfer efficiency between the heating film 3 and the battery module 1. In other embodiments, the heating film 3 can also contact the battery module 1 by applying thermally conductive silicone grease to its end face.

[0067] This application does not specifically limit the connection method between the heating film 3 and the mounting area. Preferably, the heating film 3 is fixedly connected to the mounting area with double-sided adhesive to reduce the difficulty of fixing the heating film 3, improve the assembly efficiency of the heating film 3, and reduce the fixing cost of the heating film 3 compared with the solution of fixing the heating film 3 to the liquid cooling plate 2 with structural adhesive, thereby reducing the production cost of the battery pack. Of course, in other embodiments, the heating film 3 can also be fixedly connected to the liquid cooling plate 2 by other methods such as structural adhesive, insulating fasteners, and snap-fit ​​structures.

[0068] This application does not specify the relative positions of the liquid cooling plate 2 and the battery module 1. Preferably, refer to Figure 2The liquid cooling plate 2 is located at the bottom of the battery module 1, so that it is closer to the gap between the vehicle bottom and the ground, thereby ensuring the self-heating performance of the liquid cooling plate 2 and improving the cooling effect of the liquid cooling plate 2 on the battery module 1. It also facilitates the maintenance of the liquid cooling plate 2. In other embodiments, the battery module 1 can also be located at the bottom of the liquid cooling plate 2, that is, the liquid cooling plate 2 is located above the battery module 1.

[0069] This application does not specifically limit the formation method in which the heating area of ​​the first heating film 31 is larger than the heating area of ​​the second heating film 32. Preferably, refer to Figure 4 and Figure 6 The length of the first heating film 31 is equal to the length of the second heating film 32, and the width of the first heating film 31 is greater than the width of the second heating film 32, so that the heating area of ​​the first heating film 31 is greater than the heating area of ​​the second heating film 32. At the same time, it can also reduce the influence of the second heating film 32 on the direct heat transfer area between the center position of the battery module 1 and the liquid cooling plate 2, so as to further ensure the cooling effect on the center position of the battery module 1.

[0070] In other embodiments, the width of the first heating film 31 is equal to the width of the second heating film 32, and the length of the first heating film 31 is greater than the length of the second heating film 32, so that the heating area of ​​the first heating film 31 is greater than the area of ​​the second heating film 32.

[0071] In a preferred embodiment, refer to Figure 6 The first heating film 31 has a first clearance notch 311 on its side. The first clearance notch 311 penetrates the first heating film 31 in the thickness direction, thereby reducing the area of ​​the first heating film 31. This increases the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby further ensuring the connection stability between the liquid cooling plate 2 and the battery module 1 and further ensuring the structural strength of the battery pack. At the same time, it also further reduces the amount of heating film 3 used, thereby further reducing the production cost and weight of the battery pack.

[0072] This application does not specify the number of the first clearance gap 311; preferably, refer to... Figure 6One first clearance notch 311 is provided, and the first clearance notch 311 is located in the middle of the length direction of the first heating film 31. That is to say, the projection of the first heating film 31 toward the plane where the liquid cooling plate 2 is located is C-shaped, so as to ensure the structural strength of the first heating film 31, thereby ensuring the service life of the first heating film 31, and at the same time reducing the manufacturing difficulty of the first heating film 31. In other embodiments, multiple first clearance notches 311 may be provided, with multiple first clearance notches 311 located on the same side of the first heating film 31, or multiple first clearance notches 311 located on both sides of the first heating film 31, and the first clearance notches 311 on both sides of the first heating film 31 are staggered with each other.

[0073] In a preferred embodiment, refer to Figure 6 The second heating film 32 has a second clearance notch 321 on its side. The second clearance notch 321 penetrates the second heating film 32 in the thickness direction, thereby reducing the area of ​​the second heating film 32. This increases the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby further ensuring the connection stability between the liquid cooling plate 2 and the battery module 1 and further ensuring the structural strength of the battery pack. At the same time, it further reduces the amount of heating film 3 used, thereby further reducing the production cost and weight of the battery pack.

[0074] This application does not specify the number of the second clearance gap 321; preferably, refer to... Figure 6 One second clearance notch 321 is provided, and the second clearance notch 321 is located in the middle of the length direction of the second heating film 32. That is, the projection of the second heating film 32 toward the plane where the liquid cooling plate 2 is located is C-shaped, so as to ensure the structural strength of the second heating film 32, thereby ensuring the service life of the second heating film 32, and at the same time reducing the manufacturing difficulty of the second heating film 32. In other embodiments, there may be multiple second clearance notches 321, with multiple second clearance notches 321 located on the same side of the second heating film 32, or multiple second clearance notches 321 located on both sides of the second heating film 32, and the second clearance notches 321 on both sides of the second heating film 32 are staggered.

[0075] In a preferred embodiment, refer to Figure 5 and Figure 6The first heating film 31 is provided with a first adhesive-containing hole 312, which penetrates the first heating film 31 in the thickness direction. This allows the thermally conductive structural adhesive used to fix the first heating film 31 to the battery module 1 to flow into the first adhesive-containing hole 312, so that the thermally conductive structural adhesive flowing into the first adhesive-containing hole 312 can solidify on the liquid cooling plate 2. This increases the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby increasing the connection stability between the liquid cooling plate 2 and the battery module 1. It also increases the heat transfer area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby ensuring the cooling effect on the battery module 1. Furthermore, it also increases the connection stability between the first heating film 31 and the liquid cooling plate 2 and the battery module 1.

[0076] It should be noted that, due to the setting of the first adhesive hole 312, it is necessary to design a clearance hole on the double-sided adhesive used to fix the first heating film 31 to the liquid cooling plate 2 corresponding to the first adhesive hole 312, so that the thermally conductive structural adhesive flowing into the first adhesive hole 312 can contact the liquid cooling plate 2, or the first adhesive hole 312 can be set at the center of the first heating film 31 and the double-sided adhesive can be pasted on the side of the first heating film 31, or the double-sided adhesive can be broken in the first adhesive hole 312.

[0077] This application does not specifically limit the structure of the first adhesive-containing hole 312; preferably, refer to... Figure 5 and Figure 6 The first adhesive-receiving hole 312 is an oblong hole to further increase the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby further increasing the connection stability between the liquid cooling plate 2 and the battery module 1. It also further increases the heat transfer area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thus further improving the cooling effect on the battery module 1. Of course, in other embodiments, the first adhesive-receiving hole 312 can also be a hole structure of other shapes such as a round hole, square hole, or diamond hole.

[0078] The better one is to refer to Figure 5 and Figure 6Four first adhesive-receiving holes 312 are provided. Two of the first adhesive-receiving holes 312 are located near the ends of the first heating film 31, and the remaining two are located near the middle position of the first heating film 31 along its length. The first adhesive-receiving holes 312 located near the ends of the first heating film 31 are parallel to the length direction of the first heating film 31, and the first adhesive-receiving holes 312 located near the middle position of the first heating film 31 are parallel to the width direction of the first heating film 31. The four first adhesive-receiving holes 312 are symmetrically arranged about the middle position of the first heating film 31 along its length to reduce the manufacturing difficulty of the first heating film 31 and to make the first adhesive-receiving holes 312 evenly distributed on the first heating film 31, so as to further improve the heat distribution uniformity of the battery module 1.

[0079] In a preferred embodiment, refer to Figure 5 and Figure 6 The second heating film 32 is provided with a second adhesive-containing hole 322, which penetrates the second heating film 32 in the thickness direction. This allows the thermally conductive structural adhesive used to fix the second heating film 32 to the battery module 1 to flow into the second adhesive-containing hole 322, so that the thermally conductive structural adhesive flowing into the second adhesive-containing hole 322 can solidify on the liquid cooling plate 2. This increases the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby increasing the connection stability between the liquid cooling plate 2 and the battery module 1. It also increases the heat transfer area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby ensuring the cooling effect on the battery module 1. Furthermore, it also increases the connection stability between the first heating film 31 and the liquid cooling plate 2 and the battery module 1.

[0080] It should be noted that, due to the setting of the second adhesive hole 322, it is necessary to design a clearance hole on the double-sided adhesive used to fix the second heating film 32 to the liquid cooling plate 2 corresponding to the second adhesive hole 322, so that the thermally conductive structural adhesive flowing into the second adhesive hole 322 can contact the liquid cooling plate 2, or the second adhesive hole 322 can be set at the center of the second heating film 32 and the double-sided adhesive can be pasted on the side of the second heating film 32, or the double-sided adhesive can be broken in the second adhesive hole 322.

[0081] This application does not specifically limit the structure of the second adhesive-containing hole 322; preferably, refer to... Figure 5 and Figure 6The second adhesive-receiving hole 322 is an oblong hole to further increase the connection area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thereby further increasing the connection stability between the liquid cooling plate 2 and the battery module 1. It also further increases the heat transfer area between the liquid cooling plate 2 and the battery module 1 through the thermally conductive structural adhesive, thus further improving the cooling effect on the battery module 1. Of course, in other embodiments, the second adhesive-receiving hole 322 can also be a hole structure of other shapes such as a round hole, square hole, or diamond hole.

[0082] The better one is to refer to Figure 5 and Figure 6 Two second adhesive-receiving holes 322 are provided, and the two second adhesive-receiving holes 322 are respectively located near the two ends of the second heating film 32 along its length, so that the second adhesive-receiving holes 322 can avoid the second clearance notch 321, thereby ensuring the structural strength of the second heating film 32. The two second adhesive-receiving holes 322 are both parallel to the length of the second heating film 32, and the two second adhesive-receiving holes 322 are symmetrically arranged about the middle position of the length of the second heating film 32, so as to reduce the production difficulty of the second heating film 32 and make the second adhesive-receiving holes 322 evenly distributed on the second heating film 32, thereby further improving the heat distribution uniformity of the battery module 1.

[0083] This application does not specifically limit the structure of battery module 1; preferably, refer to... Figure 1 , Figure 2 , Figure 7 and Figure 8 The battery module 1 includes a first battery module 11 and a second battery module 12. At least two first heating films 31 are provided, and the two first heating films 31 are respectively located on the side of the first battery module 11 and the second battery module 12 that are far apart from each other. At least two second heating films 32 are provided, and the two second heating films 32 are respectively located on the side of the first battery module 11 and the second battery module 12 that are close to each other.

[0084] It is understandable that both the first battery module 11 and the second battery module 12 are provided.

[0085] Since the battery module 1 includes a first battery module 11 and a second battery module 12, the sides of the battery module 1 are the sides where the first battery module 11 and the second battery module 12 are far apart from each other, while the center of the battery module 1 is the side where the first battery module 11 and the second battery module 12 are close to each other. By placing two first heating films 31 on the sides where the first battery module 11 and the second battery module 12 are far apart from each other, the heating effect on the sides of the battery module 1 can be guaranteed. By placing two second heating films 32 on the sides where the first battery module 11 and the second battery module 12 are close to each other, the heating effect on the center of the battery module 1 can be guaranteed.

[0086] This application does not specify the number of the first heating film 31 and the second heating film 32. Preferably, refer to Figure 2 , Figure 7 and Figure 8 There are two of each of the first heating film 31 and the second heating film 32. One of the first heating films 31 is located on the side of the first battery module 11 away from the second battery module 12, and the other of the first heating films 31 is located on the side of the second battery module 12 away from the first battery module 11. One of the second heating films 32 is located on the side of the first battery module 11 close to the second battery module 12, and the other of the second heating films 32 is located on the side of the second battery module 12 close to the first battery module 11. In other words, one of the first heating films 31 and one of the second heating films 32 are set corresponding to the first battery module 11, and the other of the first heating films 31 and the other of the second heating films 32 are set corresponding to the second battery module 12.

[0087] In other embodiments, the second heating film 32 may be provided in two sets, one set of the second heating film 32 corresponding to the first battery module 11 and the other set of the second heating film 32 corresponding to the second battery module 12. Each set of the second heating film 32 has multiple second heating films 32 arranged at intervals, and the heating area of ​​the multiple second heating films 32 gradually decreases along the direction away from the corresponding first heating film 31, so as to further improve the uniformity of heat distribution of the battery module 1 when heating the battery module 1.

[0088] This application does not specifically limit the connection relationship between the first heating film 31 and the second heating film 32. Preferably, refer to Figure 5 and Figure 6 A conductive wire bundle 313 is provided between the first heating film 31 and the second heating film 32. The two ends of the conductive wire bundle 313 are respectively connected to the same end of the first heating film 31 and the second heating film 32. A conductive terminal 314 is provided at the end of the first heating film 31 and the second heating film 32 away from the conductive wire bundle 313. The conductive terminals 314 on two adjacent second heating films 32 are inserted and matched.

[0089] It is understood that one end of the conductive wire harness 313 is electrically connected to the first heating film 31, and the other end of the conductive wire harness 313 is electrically connected to the second heating film 32, and the conductive wire harness 313 is connected to the same end of the first heating film 31 and the second heating film 32; each conductive terminal 314 has a wire harness electrically connected to the heating film 3, that is, the conductive terminal 314 connected to the first heating film 31 has a wire harness electrically connected to the first heating film 31, and the conductive terminal 314 connected to the second heating film 32 has a wire harness electrically connected to the second heating film 32.

[0090] Since the two ends of the conductive wire harness 313 are respectively connected to the same end of the first heating film 31 and the second heating film 32, and the conductive terminals 314 on the two adjacent second heating films 32 are plugged in, the first heating film 31 and the second heating film 32 are connected end to end, and the two adjacent second heating films 32 are connected end to end, so as to reduce the number of circuit connectors that the vehicle needs to configure for the heating film 3, thereby reducing the production cost of the vehicle equipped with the battery pack of this application; at the same time, it can also make the weight distribution of the battery pack more uniform, so as to optimize the weight distribution ratio of the vehicle in the later stage.

[0091] Furthermore, by using conductive wire harness 313 to connect the first heating film 31 and the second heating film 32 into one unit, it is possible to make the first heating film 31 and the second heating film 32 form a whole, so as to facilitate the group installation of the first heating film 31 and the second heating film 32.

[0092] This application does not specifically limit the structure of the conductive terminal 314. Preferably, the conductive terminal 314 is a wire harness connector, and the conductive terminal 314 on one of the first heating films 31 is the plug of the wire harness connector, the conductive terminal 314 on the other first heating film 31 is the socket of the wire harness connector, and the conductive terminals 314 on the two second heating films 32 are respectively the plug and socket of the wire harness connector, so as to facilitate the electrical connection between the heating film 3 and the power supply components on the vehicle. In other embodiments, the conductive terminal 314 can also be other conductive structures that can be plugged into each other.

[0093] In other embodiments, the conductive wire harness 313 and the conductive terminal 314 can be omitted. That is, the first heating film 31 and the second heating film 32 are not directly connected. Therefore, multiple lines electrically connected to the first heating film 31 and the second heating film 32 need to be set on the vehicle. Alternatively, two adjacent first heating films 31 and second heating films 32 can also be electrically connected through the plug-in cooperation of the conductive terminal 314. Alternatively, two adjacent second heating films 32 can also be electrically connected through the conductive wire harness 313.

[0094] Furthermore, the ends of the first heating film 31 and the second heating film 32 are both bent toward the side where the battery module 1 is located and form a connecting section, which is located on the outside of the battery module 1.

[0095] It is understood that both ends of the first heating film 31 and the second heating film 32 in the length direction are bent toward the side where the battery module 1 is located and form a connecting segment. The two ends of the conductive wire harness 313 are respectively connected to the connecting segment at one end of the first heating film 31 and the connecting segment at one end of the second heating film 32. The wire harness of each conductive terminal 314 is respectively connected to the connecting segment at the other end of the corresponding first heating film 31 or the other end of the second heating film 32.

[0096] Since the ends of the first heating film 31 and the second heating film 32 are both bent towards the side where the battery module 1 is located and form a connecting section, and the connecting section is located on the outside of the battery module 1, the conductive wire harness 313 and the conductive terminal 314 can avoid the battery module 1, so as to prevent the battery module 1 from squeezing the conductive wire harness 313 and the conductive terminal 314, thereby ensuring the service life of the conductive wire harness 313 and the conductive terminal 314, thus ensuring the service life of the battery pack and reducing the failure rate of the battery pack; and compared with the solution where the conductive wire harness 313 and the conductive terminal 314 are located between the liquid cooling plate 2 and the battery module 1, the distance between the liquid cooling plate 2 and the battery module 1 is reduced, thereby ensuring the cooling efficiency and heating efficiency of the battery module 1.

[0097] Furthermore, refer to Figure 5 , Figure 6 and Figure 7 Each connecting segment is provided with a reinforcing layer 323 on its exterior. The wire harnesses of the conductive wire harness 313 and the conductive terminal 314 are at least partially located within the corresponding reinforcing layer 323, thereby increasing the connection stability between the conductive wire harness 313 and the conductive terminal 314 and the connecting segment. This ensures the electrical connection stability between the conductive wire harness 313 and the conductive terminal 314 and the heating film 3, thereby ensuring the heating effect of the heating film 3 on the battery module 1 and reducing the failure rate of the battery pack.

[0098] This application does not specifically limit the formation method of the reinforcing layer 323. Preferably, epoxy resin boards are provided on both opposite sides of the connecting segment, and the two epoxy resin boards are fixedly connected together by heat fusion, so that the reinforcing layer 323 is formed on the outside of the connecting segment. Furthermore, the wire harness of the conductive wire harness 313 or conductive terminal 314 is at least partially located between the two epoxy resin boards, thereby increasing the connection stability between the wire harness of the conductive wire harness 313 or conductive terminal 314 and the connecting segment. In other embodiments, the reinforcing layer 323 may also be formed by heat fusion of a sheet made of polypropylene material or other thermoplastic or thermosetting materials.

[0099] In other embodiments, the battery module 1 can also be an integral structure, that is, the battery pack has only one battery module 1, and at least two first heating films 31 are provided and located on opposite sides of the battery module 1, while at least one second heating film 32 is provided and located at the center of the battery module 1.

[0100] In a preferred embodiment, refer to Figures 1 to 4 The battery pack also includes a housing 4, with connecting beams 41 on both opposite sides of the housing 4. The battery module 1 is provided with connecting ears 111, which are connected to the connecting beams 41. The wire harnesses of the conductive wire harness 313 and the conductive terminal 314 are all connected to the connecting beams 41 by fasteners 315.

[0101] It is understood that the battery module 1 is located inside the housing 4, the liquid cooling plate 2 is located at the bottom of the housing 4, and the two ends of the first battery module 11 and the second battery module 12 in the length direction are provided with connecting ears 111 corresponding to the connecting beam 41, so that the two ends of the first battery module 11 and the second battery module 12 are fixedly connected to the connecting beam 41 through the connecting ears 111.

[0102] Since the housing 4 is provided with a connecting beam 41, and the battery module 1 is provided with a connecting lug 111 connected to the connecting beam 41, the battery module 1 can be fixedly connected to the housing 4 using the connecting lug 111, thereby increasing the stability of the battery module 1 and preventing the battery module 1 and the housing 4 from shaking relative to each other, which would affect the service life of the battery pack, thus ensuring the service life of the battery pack.

[0103] Furthermore, since the conductive wire harness 313 and the conductive terminal 314 are both connected to the connecting beam 41 by fasteners 315, the conductive wire harness 313 and the conductive terminal 314 are fixed, thereby increasing the stability of the conductive wire harness 313 and the conductive terminal 314 and preventing abnormal noise caused by the relative shaking of the conductive wire harness 313 and the conductive terminal 314 with the housing 4. This improves the quality of the battery pack, reduces abnormal noise in vehicles equipped with the battery pack of this application, and improves the user experience.

[0104] Furthermore, by setting a connecting beam 41 inside the housing 4, the structural strength of the housing 4 can be increased, thereby increasing the structural strength of the battery pack and thus increasing the service life of the battery pack.

[0105] This application does not specifically limit the structure of fastener 315; preferably, refer to... Figures 3 to 6The fastener 315 is a wire harness clip, and the connecting beam 41 is provided with a snap-fit ​​hole for the wire harness clip to engage with the connecting beam 41, so as to facilitate the fixed connection of the conductive wire harness 313 and the conductive terminal 314 to the connecting beam 41. In other embodiments, the fastener 315 can also be a cable tie or other structure that can fix the conductive wire harness 313 or the conductive terminal 314 to the connecting beam 41.

[0106] The better one is to refer to Figure 8 Multiple connecting ears 111 are spaced apart along the width direction of the battery module 1 to increase the number of connection points between the battery module 1 and the connecting beam 41, thereby increasing the stability of the battery module 1. Each connecting ear 111 is provided with a through hole for the bolt to pass through, and the connecting beam 41 is provided with a threaded hole corresponding to the through hole for the bolt to be threadedly connected, so that the connecting ear 111 can be fixedly connected to the connecting beam 41 with bolts.

[0107] Furthermore, refer to Figures 2 to 4 The connecting beam 41 is provided with a receiving notch 411, and the connecting section is located in the receiving notch 411, so that the connecting section can avoid the connecting beam 41, thereby reducing the gap between the connecting beam 41 and the battery module 1. This reduces the size of the connecting ear 111, thereby reducing the production cost of the connecting ear 111 and improving the connection stability between the battery module 1 and the connecting beam 41 through the connecting ear 111. On the other hand, it reduces the volume of the battery pack, thereby facilitating the miniaturization design of the battery pack. In addition, the receiving notch 411 can also be used to position the heating film 3, so as to facilitate the accurate installation of the heating film 3 onto the liquid cooling plate 2, thereby reducing the installation difficulty of the heating film 3, improving the production efficiency of the battery pack and ensuring the production quality of the battery pack.

[0108] Furthermore, refer to Figures 2 to 4 The housing 4 has a partition beam 42 inside, which is located between the first battery module 11 and the second battery module 12. The partition beam 42 can be used to position the first battery module 11 and the second battery module 12, so as to facilitate the installation of the first battery module 11 and the second battery module 12 and improve the assembly efficiency of the battery pack. In addition, the partition beam 42 can also increase the structural strength of the housing 4, thereby improving the structural strength of the battery pack.

[0109] This application also discloses a vehicle that includes the aforementioned battery pack.

[0110] Because the vehicle in this application uses the aforementioned battery pack, the situation where the heating film 3 easily detaches from the battery module 1 is avoided, thus preventing the heating film 3 from dry burning and eliminating potential safety hazards, thereby improving vehicle safety. In addition, the structural strength and cooling effect of the battery pack are also guaranteed to ensure the performance of the battery pack, thereby ensuring the performance of the vehicle.

[0111] This application does not specify the type of vehicle, which can be any of the following: pure electric vehicle, hybrid vehicle, range-extended vehicle, or other vehicle that requires the use of a battery pack.

[0112] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0113] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0114] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A battery pack, characterized in that, The device includes a battery module (1), a liquid cooling plate (2), and a heating film (3) disposed between the battery module (1) and the liquid cooling plate (2). One end of the heating film (3) is connected to the battery module (1), and the other end of the heating film (3) is connected to the liquid cooling plate (2). The heating film (3) includes a first heating film (31) and a second heating film (32) disposed at intervals. The second heating film (32) is located inside the first heating film (31), and the heating area of ​​the second heating film (32) is smaller than the heating area of ​​the first heating film (31).

2. The battery pack according to claim 1, characterized in that, The width of the first heating film (31) is greater than the width of the second heating film (32) so that the heating area of ​​the first heating film (31) is greater than the heating area of ​​the second heating film (32).

3. A battery pack according to claim 1, characterized in that, The first heating film (31) is provided with a first adhesive-containing hole (312), and the first adhesive-containing hole (312) penetrates the first heating film (31) in the thickness direction of the first heating film (31); And / or, the second heating film (32) is provided with a second adhesive-containing hole (322), which penetrates the second heating film (32) in the thickness direction of the second heating film (32).

4. A battery pack according to claim 1, characterized in that, The first heating film (31) has a first clearance notch (311) on its side, and the first clearance notch (311) penetrates the first heating film (31) in the thickness direction of the first heating film (31); And / or, a second clearance notch (321) is provided on the side of the second heating film (32), and the second clearance notch (321) penetrates the second heating film (32) in the thickness direction of the second heating film (32).

5. A battery pack according to any one of claims 1-4, characterized in that, The battery module (1) includes a first battery module (11) and a second battery module (12). At least two first heating films (31) are provided, and the two first heating films (31) are respectively located on the side away from each other of the first battery module (11) and the second battery module (12). At least two second heating films (32) are provided, and the two second heating films (32) are respectively located on the side close to each other of the first battery module (11) and the second battery module (12).

6. A battery pack according to claim 5, characterized in that, A conductive wire bundle (313) is provided between the first heating film (31) and the second heating film (32). The two ends of the conductive wire bundle (313) are respectively connected to the same end of the first heating film (31) and the second heating film (32). A conductive terminal (314) is provided at the end of the first heating film (31) and the second heating film (32) away from the conductive wire bundle (313). The conductive terminals (314) on two adjacent second heating films (32) are plugged into each other.

7. A battery pack according to claim 6, characterized in that, The ends of the first heating film (31) and the second heating film (32) are bent toward the side where the battery module (1) is located and form a connecting segment, which is located on the outside of the battery module (1).

8. A battery pack according to claim 7, characterized in that, Each of the connecting segments is provided with a reinforcing layer (323) on its exterior, and the wire harnesses of the conductive wire harness (313) and the conductive terminal (314) are at least partially located within the corresponding reinforcing layer (323).

9. A battery pack according to claim 7, characterized in that, The battery pack also includes a housing (4), on which connecting beams (41) are provided on opposite sides. The battery module (1) is provided with connecting ears (111), which are connected to the connecting beams (41). The conductive wire harness (313) and the wire harness of the conductive terminal (314) are both connected to the connecting beams (41) by fasteners (315).

10. A battery pack according to claim 9, characterized in that, The connecting beam (41) is provided with a receiving notch (411), and the connecting section is located in the receiving notch (411).

11. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-10 above.

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